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https://issues.apache.org/jira/browse/DRILL-4294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15112208#comment-15112208
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Sudip Mukherjee commented on DRILL-4294:
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Is this the right way to fix :
https://github.com/apache/drill/commit/19886c11352cfa45bdb2da885a86e6500986e1e3
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This was found while using Power BI.
1. Created a VIEW containing '_' backed by a csv file.
2. Connected to Power BI and it failed to load the data since the query
became erronous i.e. ' from table_name'
This is because power bi didn't get any column metadata from it's
previous query which contained ,
FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_CATALOG LIKE 'DRILL' ESCAPE
'\' AND TABLE_SCHEMA LIKE 'dfs.tmp' ESCAPE '\' AND TABLE_NAME LIKE
'app\_client_\view' ESCAPE '\' ORDER BY TABLE_CATALOG, TABLE_SCHEMA,
TABLE_NAME, ORDINAL_POSITION, COLUMN_NAME
> InfoSchema is not returning column metadata if the query contains escape
> character
> ----------------------------------------------------------------------------------
>
> Key: DRILL-4294
> URL: https://issues.apache.org/jira/browse/DRILL-4294
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: Future, 1.4.0
> Reporter: Sudip Mukherjee
>
> Below Query returns noting where escape character is "\\":
> SELECT TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, CASE DATA_TYPE
> WHEN 'ANY', 'MAP' THEN 'CHARACTER VARYING' ELSE DATA_TYPE END as DATA_TYPE,
> CASE DATA_TYPE WHEN 'ANY', 'MAP' THEN 'CHARACTER VARYING' ELSE DATA_TYPE END
> as DATA_TYPE_NAME, CASE DATA_TYPE WHEN 'BINARY' THEN
> CHARACTER_MAXIMUM_LENGTH WHEN 'CHARACTER VARYING' THEN
> CHARACTER_MAXIMUM_LENGTH WHEN 'CHARACTER' THEN
> CHARACTER_MAXIMUM_LENGTH WHEN 'DATE' THEN DATETIME_PRECISION
> WHEN 'INTERVAL' THEN INTERVAL_PRECISION WHEN 'VARCHAR'
> THEN CHARACTER_MAXIMUM_LENGTH WHEN 'VARBINARY' THEN
> CHARACTER_MAXIMUM_LENGTH ELSE NUMERIC_PRECISION END as
> COLUMN_SIZE, NUMERIC_SCALE as DECIMAL_DIGITS, CASE DATA_TYPE
> WHEN 'CHARACTER VARYING' THEN CHARACTER_MAXIMUM_LENGTH
> WHEN 'CHARACTER' THEN CHARACTER_MAXIMUM_LENGTH WHEN 'VARCHAR'
> THEN CHARACTER_MAXIMUM_LENGTH ELSE 9 END as
> BUFFER_LENGTH, NUMERIC_PRECISION_RADIX, IS_NULLABLE as
> NULLABLE, 12 as REMARKS, 13 as COLUMN_DEF, 14 as
> SQL_DATA_TYPE, 15 as SQL_DATETIME_SUB,
> CHARACTER_MAXIMUM_LENGTH as CHAR_OCTET_LENGTH, ORDINAL_POSITION,
> IS_NULLABLE, 18 as USER_DATA_TYPE FROM INFORMATION_SCHEMA.COLUMNS
> WHERE TABLE_CATALOG LIKE 'DRILL' ESCAPE '\' AND TABLE_SCHEMA LIKE 'dfs.tmp'
> ESCAPE '\' AND TABLE_NAME LIKE 'app\_client\_view' ESCAPE '\' ORDER BY
> TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION, COLUMN_NAME
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